B chromosomes in Rattus fuscipes II. The transmission of B chromosomes to offspring and population studies: support for the “parasitic” model

Thomson, R L

doi:10.1038/hdy.1984.44

Cited by 22 publications

(21 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous sudies revealed a non-random pattern of B-chromosome distribution (Nur 1969, Thomson 1984, and various biological reasons for this have been taken into account. Due to intraspecific variation in their presence and frequency among populations dwelling in different habitats, it has been frequently stated that B chromosomes have an adaptive significance (Darlington 1963, Gibson and Hewitt 1972, Miintzing 1974, Hutchinson 1975, Carter 1978.…”

Section: Discussionmentioning

confidence: 99%

B chromosomes in the wood mice (genus Apodemus )

Zima¹,

Macholán²

1995

Acta Theriol.

View full text Add to dashboard Cite

Spatial and temporal distribution of supernumerary or B chromosomes were studied in natural populations of wood mice. A total of 859 individuals belonging to several species from Eurasia were examined. A very high percentage of individuals possessing B chromosomes was found in Apodemus peninsulae (97.9%, n = 47), a high percentage in A. flavicollis (42.5%, n = 362), and a low one in A. sylvaticus (2.4%, n = 210). No B chromosomes were observed in A. uralensis (n = 10), A. fuluipectus (n = 19), A. hermonensis (n = 1), A. agrarius (n = 58), A. mystacinus (n = 7), and in Apodemus species collected in Turkey (n = 74), Israel (n = 1), Azerbaijan (n = 2), Tadjikistan (n = 24), and Kyrghyzstan (n = 44). A modest to high frequency of B chromosomes was thus observed particularly in the species confined to a forest environment, whereas no B's were found in the species dwelling in open, steppe-like or rocky habitats. Both in A. peninsulae and A. flavicollis the frequency of B chromosomes varied among local populations. Follow-up studies revealed stability in the respective proportions of B chromosomes during subsequent years. However, no unambiguous interrelationship could be found between the frequency of B chromosomes and various biological and/or ecological variables. Therefore it seems that the incidence of B chromosomes is mainly determined by stochastic effects operating within the specific genetic background of a population.

show abstract

Section: Discussionmentioning

confidence: 99%

B chromosomes in the wood mice (genus Apodemus )

Zima¹,

Macholán²

1995

Acta Theriol.

View full text Add to dashboard Cite

show abstract

“…However, reanalysis of these data, taking into account the inclusion of karyotypes of related eggs in an egg pod, suggested that there was only weak evidence of a rise in B-frequency between adults and autumn eggs and no change in frequency between autumn and spring eggs (see Shaw et a!., 1985). In Rattus fuscipes, individuals from natural populations were karyotyped before and after breeding (Thomson, 1984). Rats with B-chromosomes were found to be at least twice as likely to be lost from the population before breeding than rats without B-chromosomes.…”

Section: Discussionmentioning

confidence: 99%

B-chromosome selection in Allium schoenoprasum. I. Natural populations

Holmes

Bougourd

1989

Heredity

View full text Add to dashboard Cite

The B-chromosome constitution of a seed sample of Allium schoenoprasum collected from a sub-population at the River Wye, Powys, S. Wales in July 1982 has been compared with that of a seedling sample collected from the same sub-population in September 1982. The seedling sample contained significantly more B-containing plants than the seed sample (64.1 per cent vs. 55•2 per cent), and the mean number of B-chromosomes in B-containing plants was also significantly increased in the seedlings (244 vs. 2.23). This implies that there is differential selection in favour of B-containing seedlings and seedlings with increased numbers of B-chromosomes during the initial stages of the life cycle when levels of mortality of A. schoenoprasum in this riverside habitat are high.Non-standard types of B-chromosome accounted for a smaller proportion of the B-chromosomes in the seedlings compared with that in the seeds (9.7 per cent vs. 152 per cent), and there was a marked reduction in the frequency of plants carrying only non-standard B-types amongst the seedlings (6.2 per cent vs. 125 per cent).

show abstract

“…The theoretical manipulations become somewhat involved, and the role which B chromosomes may play is difficult to determine. This is particularly so because of the general deleterious effect that B chromosomes have on their hosts in many species, including Rattus fuscipes (Thomson, 1984).…”

Section: Methodsmentioning

confidence: 99%

“…It forms the background for a population study (Thomson, 1984) which gives an assessment of the fitness of B chromosome-bearing individuals in natural populations.…”

Section: Introductionmentioning

confidence: 99%